In an effort to track the nation’s recovery from the recession, many experts look to the U.S. auto industry as a barometer for economic improvement. Over the last four months, new and used car sales have steadily risen, giving hope to many that the turbulent economic conditions of 2008 are now behind us.

Since the beginning of the year, U.S. auto sales have increased each month, resulting in 162,610 more vehicles being purchased compared to the same 4-month stretch in 2009, according to Auto Week.

Specifically, Nissan North America had the most impressive April, increasing their sales by 35 percent compared to March. Ford, Chrysler, Hyundai–Kia and Toyota also had excellent months. However, based simply on overall volume of sales, General Motors sported the number one ranking for April.

“We’re seeing the ebb and flow of the market recovery,” Joseph Phillippi, president of AutoTrends Consulting, told Business Week. “We’re still working our way off the bottom. A rising tide lifts all boats, but some are lighter than others.”

Michelle Krebs, a research analyst with Edmunds.com, noted that the car manufacturers that are having the most success are those that sell moderately priced vehicles.