Year	Percent
1950	29.27889
1955	27.89967
1960	26.01678
1965	25.19951
1970	25.70843
1975	27.35345
1980	29.82163
1985	31.72689
1990	31.93004
1995	30.90405
2000	29.58958
2005	28.23621
2010	28.23729
2015	27.86171
2020	27.09567
2025	25.99889
2030	25.46878
2035	24.46696
2040	24.15628
2045	23.94298
2050	23.31468
2055	22.68747
2060	22.21989
2065	21.83498
2070	21.56297
2075	21.34462
2080	21.11461
2085	20.8387
2090	20.56955
2095	20.35581
2100	20.19234