Year	Percent
1950	18.93479
1955	18.0412
1960	17.94631
1965	17.0197
1970	16.57736
1975	16.49042
1980	16.80056
1985	17.00872
1990	17.44376
1995	19.77953
2000	21.74419
2005	25.06657
2010	28.7176
2015	30.09553
2020	30.20821
2025	29.66062
2030	30.00444
2035	29.09373
2040	28.43621
2045	27.40003
2050	24.85199
2055	24.4766
2060	25.23306
2065	25.52832
2070	25.04946
2075	24.01798
2080	23.29081
2085	23.12929
2090	23.23734
2095	23.27815
2100	23.08403