 According to a 2011 estimate by IMTA based on a sample of 96 utilities, only 73% of the total amount of water bills was actually collected on average.According to Conagua, US$2.2 billion (MxP 28.6 billion) were invested in the sector in 2011, which is US$19 per capita.Compared to the investment from 1996 to 2002, which was between US$3.7 and US$5.5 per capita, this is a significant increase.