Year	Percent
1950	30.67742
1955	29.67239
1960	28.47196
1965	27.1421
1970	25.82665
1975	25.82424
1980	26.29772
1985	26.75926
1990	27.26202
1995	27.4735
2000	27.90514
2005	28.94855
2010	30.0506
2015	30.68232
2020	30.96753
2025	30.95372
2030	31.07026
2035	31.51409
2040	31.84843
2045	31.9343
2050	31.71605
2055	31.30554
2060	30.98874
2065	30.77673
2070	30.58873
2075	30.33904
2080	30.02336
2085	29.67104
2090	29.34151
2095	29.03196
2100	28.70385