Year	% of total
1990	7.258385596737506
1991	7.382629400892459
1992	7.30778026021705
1993	7.399450614124115
1994	7.047749664783552
1995	6.866442287246677
1996	6.898194711278241
1997	7.0288944363504875
1998	6.9184451976966
1999	6.862512828161457
2000	7.110065606542686
2001	7.148896553348425
2002	6.9945640314526445
2003	7.034490854267163
2004	6.991026495401846
2005	6.987316238901869
2006	7.120935482204905
2007	7.14905922321942
2008	7.253814541026168