Year	% of total
1990	7.149970850126812
1991	7.294854572455584
1992	7.234468932727589
1993	7.341329666785672
1994	7.010793891775752
1995	6.83457936106441
1996	6.88061993415216
1997	7.0157798261065105
1998	6.908327331882247
1999	6.859080707542042
2000	7.095656239909544
2001	7.130389752998693
2002	6.981151280979011
2003	7.018374036331171
2004	6.976537589771237
2005	6.962636357702125
2006	7.085074191521721
2007	7.1130133088086085
2008	7.2226058448407455