Year	% of total
1990	48.06666480231793
1991	47.743557940140015
1992	47.47344961071511
1993	46.92137369434547
1994	46.78909342268864
1995	47.483994530120434
1996	47.98515484655009
1997	46.1335894624765
1998	46.285624207966
1999	46.71178076960569
2000	46.18015855312318
2001	45.651602315036605
2002	45.19374218591627
2003	44.85067498656194
2004	45.28245760661192
2005	45.41763110507441
2006	44.241451950005846
2007	42.984778917391296
2008	42.22923841303888