Year	Percent
1950	15.39221
1955	14.51462
1960	15.97002
1965	16.83744
1970	17.07881
1975	16.9334
1980	16.93008
1985	16.96188
1990	17.13155
1995	15.91653
2000	14.54813
2005	13.07587
2010	13.17576
2015	13.0489
2020	12.14659
2025	11.09618
2030	10.1871
2035	9.60005
2040	9.22285
2045	8.81234
2050	8.29141
2055	7.74072
2060	7.28515
2065	6.9572
2070	6.70274
2075	6.47162
2080	6.22464
2085	5.98393
2090	5.7767
2095	5.63028
2100	5.52317