Year	Percent
1950	30.19273
1955	28.81348
1960	27.24392
1965	26.01104
1970	28.02416
1975	31.16842
1980	34.13874
1985	36.09354
1990	34.94502
1995	32.66021
2000	30.26576
2005	28.25155
2010	27.94419
2015	27.77471
2020	27.19917
2025	25.81323
2030	25.02617
2035	24.07127
2040	23.89253
2045	24.14078
2050	23.98266
2055	23.66461
2060	23.30226
2065	23.0337
2070	22.88837
2075	22.85076
2080	22.78686
2085	22.62139
2090	22.38143
2095	22.13469
2100	21.92696