Year % change from 1990 1991 5.41888083887185 1992 -2.99264691443635 1993 -1.72593483294411 1994 0.189175067751535 1995 5.09611117270861 1996 5.17408522696927 1997 10.7959197320416 1998 9.49680140149409 1999 8.25334972857905 2000 8.1014958384422 2001 24.8305303482401 2002 10.8375629505977 2003 14.9995802300767 2004 16.1564406663791 2005 18.5795679694902 2006 18.019031154548 2007 33.5331856849195 2008 38.2617768026143 2009 38.5169648163513 2010 44.369923201458 2011 48.3109752709479 2012 51.8617851499307