Year	Percent
1950	30.33574
1955	29.26229
1960	28.33865
1965	27.52939
1970	26.8663
1975	26.38793
1980	25.81337
1985	25.39272
1990	25.64993
1995	26.15134
2000	26.84415
2005	27.52124
2010	27.79063
2015	28.06767
2020	28.39825
2025	28.95285
2030	29.82911
2035	30.58308
2040	31.0913
2045	31.35772
2050	31.42528
2055	31.46764
2060	31.48228
2065	31.38872
2070	31.13866
2075	30.78028
2080	30.35219
2085	29.92411
2090	29.51554
2095	29.08864
2100	28.64232