approximately 220,000, which is approximately 70,000 units higher than originally anticipated earlier in the year. Any significant decline in North American retail sales may materially and adversely affect our retail commercial truck dealerships. We expect continued similar performance in the fourth quarter for truck sales and service assuming the pandemic rates remain moderate and shelter-in-place orders are not reinstated. See “COVID-19 Disclosure” above.
Commercial Vehicle Distribution. Our Penske Australia distribution business operates principally in the Australian and New Zealand heavy and medium-duty truck markets. During the three months ended September 30, 2020, the Australian heavy-duty truck market reported sales of 2,507 units, representing a decrease of 18.7% from the same period last year, while the New Zealand market reported sales of 765 units, representing a decrease of 18.2% from the same period last year. During the nine months ended September 30, 2020, the Australian heavy-duty truck market reported sales of 7,426 units, representing a decrease of 21.9% from the same period last year, while the New Zealand market reported sales of 2,019 units, representing a decrease of 26.1% from the same period last year. The brands we represent in Australia hold a 4.3% market share in the Australian heavy-duty truck market, and a 2.4% market share in New Zealand. See “COVID-19 Disclosure” above.
Penske Transportation Solutions. PTS services have been largely deemed essential by government authorities during the COVID-19 pandemic and a majority of the PTS business is generated by multi-year contracts for full-service leasing, contract maintenance and logistics services. We expect continued resilient performance in the fourth quarter for PTS assuming the pandemic rates remain moderate and shelter-in-place orders are not reinstated. See “COVID-19 Disclosure” above.
As described in “Forward-Looking Statements,” there are a number of factors that could cause actual results to differ materially from our expectations. See Part II, Item 1A, “Risk Factors.”
Operating Overview
Automotive and commercial truck dealerships represent the majority of our results of operations. New and used vehicle revenues typically include sales to retail customers, to fleet customers, and to leasing companies providing consumer leasing. We generate finance and insurance revenues from sales of third-party extended service contracts, sales of third-party insurance policies, commissions relating to the sale of finance and lease contracts to third parties, and the sales of certain other products. Service and parts revenues include fees paid by customers for repair, maintenance and collision services, and the sale of replacement parts and other aftermarket accessories, as well as warranty repairs that are reimbursed directly by various OEMs.
Our gross profit tends to vary with the mix of revenues we derive from the sale of new vehicles, used vehicles, finance and insurance products, and service and parts transactions. Our gross profit varies across product lines, with vehicle sales usually resulting in lower gross profit margins and our other revenues resulting in higher gross profit margins. Factors such as inventory and vehicle availability, customer demand, consumer confidence, unemployment, general economic conditions, seasonality, weather, credit availability, fuel prices, and manufacturers’ advertising and incentives also impact the mix of our revenues, and therefore influence our gross profit margin.
The results of our commercial vehicle distribution business in Australia and New Zealand are principally driven by the number and types of products and vehicles ordered by our customers.
Aggregate revenue and gross profit increased $4.0 million and $86.8 million, or 0.1% and 10.0%, respectively, during the three months ended September 30, 2020, and decreased $2,656.0 million and $302.9 million, or 15.4% and 11.7%, respectively, during the nine months ended September 30, 2020, compared to the same periods in 2019. See “COVID-19 Disclosure” above.
As exchange rates fluctuate, our revenue and results of operations as reported in U.S. Dollars fluctuate. For example, if the British Pound were to weaken against the U.S. Dollar, our U.K. results of operations would translate into less U.S. Dollar reported results. Foreign currency average rate fluctuations increased revenue and gross profit by $115.2 million and $16.9 million, respectively, for the three months ended September 30, 2020, and increased revenue and gross profit by $38.3 million and $4.8 million, respectively, for the nine months ended September 30, 2020. Foreign currency