Year	Percent
1950	11.19818
1955	10.4952
1960	10.53221
1965	11.87497
1970	11.84379
1975	11.74185
1980	11.4953
1985	11.34971
1990	11.23971
1995	11.41262
2000	11.08734
2005	10.52246
2010	10.08755
2015	9.68275
2020	9.12949
2025	8.24166
2030	7.90892
2035	7.57393
2040	7.24966
2045	6.86967
2050	6.48384
2055	6.19051
2060	5.99403
2065	5.83357
2070	5.67751
2075	5.53286
2080	5.40658
2085	5.30967
2090	5.24121
2095	5.19029
2100	5.13244