For now, Diet Pepsi remains the No. 7 carbonated soft drink with 4.9 percent of the market, according to Beverage Digest. That is down from 5.3 percent in 2000.
Meanwhile, Diet Coke’s share has increased in that time from 8.7 percent to 9.6 percent. Diet Coke, which still only uses aspartame, overtook regular Pepsi to become the No. 2 soda brand in 2010.
Coke remains No. 1 and Pepsi is No. 3.