Year	Percent
1950	18.44787
1955	18.22177
1960	19.08118
1965	17.94447
1970	16.31166
1975	14.9831
1980	15.56063
1985	16.21582
1990	15.19889
1995	17.74038
2000	18.24907
2005	18.81009
2010	19.79119
2015	21.10288
2020	21.79151
2025	21.86333
2030	20.74909
2035	20.06701
2040	20.06156
2045	20.75211
2050	21.99827
2055	22.66955
2060	22.80048
2065	22.68272
2070	22.53101
2075	22.58895
2080	22.79231
2085	22.93896
2090	22.9133
2095	22.74968
2100	22.54863