Year	Percent
1950	28.09267
1955	29.30866
1960	29.87532
1965	29.9005
1970	30.04549
1975	28.90777
1980	28.09405
1985	27.01155
1990	26.63993
1995	27.29817
2000	28.89089
2005	33.32059
2010	36.24755
2015	37.98772
2020	37.27577
2025	34.8478
2030	32.30152
2035	30.15285
2040	28.7851
2045	27.74696
2050	26.45375
2055	25.21542
2060	23.90232
2065	22.86988
2070	22.23897
2075	21.91713
2080	21.71741
2085	21.49968
2090	21.24219
2095	21.02184
2100	20.90538