Year	Percent
1950	11.65128
1955	11.45166
1960	11.45835
1965	13.48216
1970	13.24111
1975	12.97978
1980	12.57023
1985	12.16019
1990	11.99136
1995	11.81521
2000	11.73826
2005	11.28673
2010	10.77952
2015	10.00085
2020	9.71635
2025	9.41063
2030	9.09064
2035	8.72951
2040	8.37151
2045	8.03421
2050	7.70345
2055	7.40026
2060	7.12511
2065	6.85763
2070	6.58881
2075	6.35157
2080	6.14094
2085	5.95879
2090	5.79455
2095	5.64588
2100	5.51511