Year	% of total
1990	9.74277706299386
1991	9.58974458554488
1992	9.421778966187224
1993	9.603775662851596
1994	9.257166936452467
1995	8.488896236694835
1996	8.097705691043904
1997	8.638678073984476
1998	8.533321110673556
1999	8.340303234265615
2000	8.597440628645504
2001	8.655248835461736
2002	8.392498982512866
2003	8.355037702103752
2004	8.181319140294772
2005	8.148024569966172
2006	8.203967730996357
2007	8.235279930715285
2008	8.280318647654243