After six straight years of expansion, ridership growth began to slow in late 2016, dropping by 1.7% in October 2016 from the prior year. Although the fiscal year ending June 30, 2017 showed an average weekday ridership of 423,395, the second-highest in BART's history, this was a 2.3% drop from FY 2016. Ridership continued to decline by approximately 3% per year between 2016 and 2019, mirroring a nationwide decline in mass transit ridership in the second half of the decade. Some see this decline as linked to changes in commute patterns, the fall in gasoline prices since 2014, and competition from the private sector in the form of ride-sharing services such as Uber and Lyft. Ride-sharing has especially affected ridership on the lines to the San Francisco International Airport and the Oakland International Airport. At SFO, ride-sharing services grew by a factor of almost six or nearly 500% at the airport between 2014 and 2016. BART planners believe that competition from Uber and Lyft is reducing overall ridership growth and BART's share of airport transit.