Year	Percent
1992	3.63457
1996	5.51149
1997	2.90921
1998	4.89978
1999	2.50854
2000	3.30111
2001	5.52958
2002	4.05325
2004	4.2598
2005	3.23913
2006	3.55823
2007	3.63212