Year	Percent
1950	16.66652
1955	16.56776
1960	15.72995
1965	15.87422
1970	16.12069
1975	16.3166
1980	17.77671
1985	18.50969
1990	19.15168
1995	21.23277
2000	23.64342
2005	27.83701
2010	30.10762
2015	30.96501
2020	28.27293
2025	24.59189
2030	21.76703
2035	18.96838
2040	19.45628
2045	20.97641
2050	22.47031
2055	23.58257
2060	23.48104
2065	22.50763
2070	21.24786
2075	21.73938
2080	21.86248
2085	21.98625
2090	21.76523
2095	21.24022
2100	20.73045