Year	% of total
1990	7.873112384437231
1991	8.044125325020822
1992	7.856975444903582
1993	7.967518151843636
1994	7.83375638593498
1995	7.418283308411256
1996	7.430068573155784
1997	7.700805933674403
1998	7.596947227440126
1999	7.5294870907076605
2000	7.670654579063998
2001	7.643809120437064
2002	7.361354094636634
2003	7.442824662092806
2004	7.3909252994992185
2005	7.466980158261002
2006	7.620828450608953
2007	7.716250276154752
2008	7.848105426265739