Year	Percent
1950	19.45295
1955	20.33399
1960	18.23153
1965	16.34754
1970	15.92442
1975	15.01471
1980	15.05945
1985	13.11557
1990	11.97393
1995	13.13678
2000	15.29403
2005	18.31456
2010	20.22749
2015	20.62169
2020	20.93535
2025	21.57984
2030	23.44552
2035	25.00944
2040	24.62499
2045	23.98332
2050	23.00953
2055	23.79705
2060	25.49113
2065	26.52082
2070	26.78812
2075	25.61557
2080	25.01071
2085	25.13341
2090	25.57443
2095	25.73096
2100	25.37059