Year	Percent
1950	15.36752
1955	15.62885
1960	15.83419
1965	16.55844
1970	17.16335
1975	17.63743
1980	18.06795
1985	18.58116
1990	18.39722
1995	17.62858
2000	16.89175
2005	16.94327
2010	16.84059
2015	16.23283
2020	15.34864
2025	14.53833
2030	13.80782
2035	13.17235
2040	12.54947
2045	11.93827
2050	11.32706
2055	10.7404
2060	10.19711
2065	9.71127
2070	9.275
2075	8.84713
2080	8.43776
2085	8.05007
2090	7.68971
2095	7.35896
2100	7.05595