STWI, however, pointed out a number of achievements during the four years it operated in Guyana: "significant improvements in water quality"; an alleged reduction of non-revenue water from 61% to 44% (a figure that is in contradiction with what the government says was the result of the audit); an alleged increase in hours of water supplied and system pressure by more than 80%; an alleged increase in revenues from G$ 900m 2002 to G$1.7bn in 2006; the introduction of a customer information and billing system; and emergency supplies during the 2005 floods. STWI also pointed out several factors beyond its control that made it difficult to achieve its contractual targets: a disastrous flood in 2005; energy costs increasing by over 40%; the difficulty of recruiting and retaining qualified Guyanese staff; and the lack of timely government approval of investment programs and of the appointment of key Guyanese staff.