Year	Percent
1950	27.53743
1955	27.07668
1960	26.2219
1965	26.92347
1970	28.65928
1975	30.31763
1980	31.26329
1985	32.76376
1990	32.32425
1995	31.85631
2000	30.54964
2005	31.45528
2010	31.78642
2015	31.22851
2020	29.97884
2025	28.64779
2030	28.71891
2035	28.69024
2040	28.78232
2045	28.49915
2050	27.47547
2055	26.53847
2060	25.91692
2065	25.46283
2070	24.97567
2075	24.37144
2080	23.7295
2085	23.12623
2090	22.6312
2095	22.26121
2100	21.97846