Year	Percent
1950	27.26634
1955	25.808
1960	24.96058
1965	24.32954
1970	24.34186
1975	26.10889
1980	27.34856
1985	28.47092
1990	29.22612
1995	28.82349
2000	28.8934
2005	29.97499
2010	31.41855
2015	33.10829
2020	33.91908
2025	33.0696
2030	31.83584
2035	30.53117
2040	29.40769
2045	28.82711
2050	28.12338
2055	27.35568
2060	26.4111
2065	25.49882
2070	24.76611
2075	24.02164
2080	23.39359
2085	22.91627
2090	22.53356
2095	22.18705
2100	21.86172