Year	Percent
1950	13.66541
1955	14.81326
1960	15.06119
1965	13.26527
1970	12.71485
1975	11.00492
1980	11.7455
1985	14.04244
1990	13.78872
1995	17.10548
2000	19.79183
2005	20.44737
2010	25.35984
2015	26.76053
2020	25.84185
2025	25.17901
2030	23.25843
2035	23.35801
2040	25.11843
2045	25.88701
2050	26.32912
2055	26.25912
2060	25.76267
2065	25.53167
2070	25.45393
2075	25.27622
2080	24.92482
2085	24.48911
2090	24.12779
2095	23.92249
2100	23.84381