The number of ESE systems installed worldwide based on select manufacturers has been evaluated according to official statistics. This number is less than the overall number of ESE installed as some manufacturer production is not included. In 1986, which is the first year of available statistics, the number of installed ESE systems was 4,088. By 1996 it had reached a number of 112,412 units. In 2006 the cumulated number of installed units was 307,698. This shows a number of service years in excess of 2,482,397.
