Year	% of total
1990	6.873077142719499
1991	7.085491058315635
1992	7.137067955712651
1993	7.3564304855298115
1994	7.456928708095878
1995	7.465727404835694
1996	7.232458308249635
1997	7.699377662497594
1998	7.920618328638446
1999	7.947729990502751
2000	7.6625127039912995
2001	7.609812904346278
2002	7.881416103155777
2003	9.430880532220993
2004	9.49477813487208
2005	9.460903225615349
2006	8.81802047074919
2007	10.554245733539851
2008	9.170029217984583