Year % change from 1990 1991 -4.70628496888802 1992 6.75308047199366 1993 -4.78347865052384 1994 -0.766424114793784 1995 4.03966817582684 1996 2.96296208224387 1997 2.95660616572724 1998 14.2800100301724 1999 8.96584427374765 2000 11.8190475424124 2001 21.1822694534531 2002 25.6739245823996 2003 30.4688320914321 2004 37.8164269217633 2005 41.7954835000004 2006 41.1765148552573 2007 45.2686069636017 2008 52.8293200006735 2009 94.9596462672216 2010 59.6043898097123 2011 61.2004337078094 2012 62.7964776059065