Year	Percent
1950	15.15187
1955	15.80993
1960	15.08844
1965	15.78699
1970	17.0365
1975	18.66588
1980	20.74074
1985	21.13781
1990	21.74754
1995	23.06061
2000	24.21641
2005	25.86154
2010	27.22962
2015	27.36858
2020	27.6461
2025	28.27454
2030	28.87227
2035	29.27533
2040	28.38033
2045	26.71782
2050	24.72643
2055	23.38944
2060	23.25685
2065	23.47779
2070	23.84627
2075	23.64721
2080	23.14445
2085	22.70014
2090	22.56263
2095	22.70303
2100	22.84942