Year	Percent
1950	9.6044
1955	13.96689
1960	16.48519
1965	16.57163
1970	14.37281
1975	13.87643
1980	13.2641
1985	14.05891
1990	14.35906
1995	12.96703
2000	10.92934
2005	9.51456
2010	11.16249
2015	12.74748
2020	11.25155
2025	9.83031
2030	8.88972
2035	8.61819
2040	8.59122
2045	8.41269
2050	7.99996
2055	7.45429
2060	6.97169
2065	6.66881
2070	6.50897
2075	6.37228
2080	6.17623
2085	5.92178
2090	5.67415
2095	5.48727
2100	5.37415