Viewership of NTT INDYCAR SERIES races reached another record level on NBC this year, the network announced Wednesday.

The 17-race series, which concluded last weekend with the Firestone Grand Prix of Monterey at WeatherTech Raceway Laguna Seca, experienced a 2 percent overall viewership jump over last year’s record viewership across NBC Sports platforms. This was the most-watched series season since 2011.

This was the third consecutive year of viewership growth, including the most-streamed NTT INDYCAR SERIES season on record led by Peacock’s coverage.

Headlined by Alex Palou’s second career series championship and Josef Newgarden’s victory in the Indianapolis 500 presented by Gainbridge, the season averaged a Total Audience Delivery (TAD) of 1.32 million viewers across NBC, USA Network, Peacock and NBC Sports digital platforms. Last year, then-record viewership averaged 1.30 million viewers.

TAD is based on data from Nielsen and Adobe Analytics.

Half of the season’s 16 races on television delivered a TAD of more than 1 million viewers, tying last year for the highest mark since 2008. NBC’s 13 races posted a TAD of 1.47 million viewers, up 4 percent from last year’s coverage on NBC (1.42 million, 14 races).

Overall viewership was led by the 107th Running of the Indianapolis 500, which delivered a TAD of 4.93 million viewers across NBC and Peacock. The race also had a 13 share – the percentage of homes watching television at the time of the race – its best performance in 15 years. The 2008 race also achieved a 13 share.

Indianapolis led all markets with a 3.26 rating for the season. The rest of the top five markets were Knoxville, Tennesse; Louisville, Kentucky; Greenville, South Carolina; and Fort Myers, Florida.