Year	Percent
1950	28.79822
1955	28.45405
1960	27.99745
1965	27.5949
1970	27.1412
1975	26.9909
1980	27.47508
1985	26.67309
1990	24.12145
1995	26.94889
2000	27.00775
2005	27.1825
2010	27.18371
2015	27.40414
2020	28.075
2025	28.97082
2030	29.89855
2035	30.55779
2040	30.87938
2045	31.04728
2050	31.18697
2055	31.29593
2060	31.343
2065	31.21528
2070	30.91013
2075	30.49286
2080	30.03188
2085	29.54991
2090	29.06656
2095	28.56675
2100	28.06494