Year	% of total
1990	87.9678420957003
1991	87.52608513531374
1992	87.1810681247263
1993	86.88890959813075
1994	86.88861728032639
1995	87.10745164309526
1996	87.35857772410543
1997	87.62729892700644
1998	88.58837240923722
1999	89.03763976959098
2000	89.68469655065836
2001	89.4829487159142
2002	89.89122531572843
2003	89.862002571541
2004	89.73220852102114
2005	89.8830079823905
2006	89.197180619331
2007	89.47303855877257
2008	89.3886562615052