The executive offices of our principal subsidiary in the United States are located at 1390 Timberlake Manor Parkway, Chesterfield, Missouri 63017, and the telephone number at that location is+1-314-212-8328.
Our subsidiaries are organized under and subject to the laws of several countries. Our principal operating subsidiaries are in Canada, Cyprus, India, Ireland, Israel, Switzerland, the United Kingdom and the United States. Please see Exhibit 8 to this Annual Report on Form20-F for a listing of our significant subsidiaries.
As part of our strategy, we have pursued and may continue to pursue acquisitions and other initiatives in order to offer new products or services or otherwise enhance our market position or strategic strengths. In recent years, we have completed numerous acquisitions, which, among other things, have expanded our business into digital commerce solutions and other digital offerings, software design and development and the media and entertainment domain. In January 2016, we acquired cVidya Networks, Inc., a vendor of revenue assurance and fraud management solutions, which adds to our capabilities in the area of revenue guard and fraud management. Additionally, in September 2016, we acquired Vindicia, Inc., asoftware-as-a-service subscription management and payment solution provider, BriteBill Group Limited, a provider of personalized digital interactive billing services and Pontis, Inc., a provider of contextual digital engagement solutions, enabling us to expand our digital offerings. In July 2017, we acquired Kenzan Media, LLC, a software engineering services company that provides customized,end-to-end solutions focusing on digital transformation, andplatform-as-a-service and cloud-native application development using DevOps and microservices. In November 2017, we acquired projekt202, a leader in experience-driven software design and development. In February 2018, we acquired Vubiquity, a leading provider of premium digital content services and technology solutions, in order to further expand our capabilities in the world of media and entertainment which is increasingly converging with our traditional domain of communications. Also in February 2018, we acquired UXP Systems, a leader in user lifecycle management, to enhance our capabilities around digital identity, user entitlements, personalization, and privacy, including consent management. In August 2019, we acquired TTS Wireless, a provider of mobile network engineering services, specializing in network optimization and planning, to further expand our 5G capabilities and help operators accelerate and simplify deployment of 5G networks with comprehensive network rollout solutions.
As the result of our organic growth and acquisitions, our workforce has increased over the last three years from an approximate average workforce of 24,237 in fiscal 2017 to 24,516 in fiscal 2019. In the past, our workforce has fluctuated with changes in business conditions.
Our principal capital expenditures for fiscal 2019 and 2018 have been for computer equipment in our operating facilities and development centers, for which we spent approximately $110 million and $118 million, respectively and the development of our new campus in Israel for which we spent approximately $7 million (which is net of proceed of $9.7 million relating to refund of betterment levy) and $96 million, respectively. In 2017, our principal capital expenditures have been for computer equipment in our operating facilities and development centers, for which we spent approximately $114 million.
Business Overview
Amdocs is a leading provider of software and services for more than 350 communications, Pay TV, entertainment and media industry and other service providers in developed countries and emerging markets. Our customers include some of the largest telecommunications companies in the world (including America Movil, AT&T, Bell Canada, Singtel, Sprint, Telefonica, Telstra,T-Mobile and Vodafone), as well as cable and satellite providers (including Altice USA, Charter, Comcast, DISH, J:COM, Rogers Communications and Sky), small to midsized communications businesses and mobile virtual network enablers/mobile virtual network operators and directory publishers and other providers of media and other services. Amdocs also has technology and distribution ties to more than 600 content creators to bring premium content to over 1,000 video distributors worldwide, including Verizon, Turner and Warner Bros.
Our software and services, which we develop, implement and manage, are designed to meet the business imperatives of our customers. Our offerings are based on a product and services mix, using technologies and
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