Year	Percent
1950	9.76157
1955	9.85586
1960	10.24956
1965	10.3254
1970	9.70961
1975	10.02018
1980	9.88447
1985	9.14719
1990	9.18775
1995	9.18934
2000	8.61733
2005	8.12802
2010	7.76827
2015	7.41989
2020	7.15867
2025	6.89597
2030	6.61057
2035	6.30612
2040	6.03383
2045	5.81992
2050	5.64864
2055	5.49388
2060	5.35136
2065	5.22228
2070	5.11139
2075	5.02153
2080	4.96221
2085	4.91583
2090	4.87036
2095	4.8366
2100	4.79669