The authority to provide funding granted under subdivision (a)(12)(A) applies only to natural gas utility districts that serve customers in counties with the following populations, according to the 1990 federal census or any subsequent federal census: not less than nor more than
16,300 16,650
29,100 29,400
33,010 33,500
35,075 35,200
44,500 45,000
51,000 51,300
68,100 68,400