This standard represents the target for energy efficiency that has to be reached by all products of a product category within a certain time frame. For example, the energy efficiency of air conditioners improved by 68% between 1997 and 2004, electric refrigerators by 55% (1998-2004), passenger vehicles by23% (1995-2005) and computers by 99% (1997-2005). Overall, the Top Runner program is expected to achieve 0.35 exa Joules (eJ) of energy savings between 1998 and 2010.