Year	Percent
1950	28.71492
1955	28.73825
1960	27.13599
1965	26.31074
1970	25.59129
1975	25.43445
1980	25.95321
1985	26.09059
1990	26.17413
1995	25.89481
2000	26.00017
2005	26.43065
2010	26.89152
2015	27.44465
2020	28.03166
2025	28.82667
2030	29.65415
2035	30.32333
2040	30.88992
2045	31.27829
2050	31.54233
2055	31.68361
2060	31.66383
2065	31.49263
2070	31.19122
2075	30.80877
2080	30.37595
2085	29.89538
2090	29.37937
2095	28.83482
2100	28.27698