Year	Percent
1950	27.70165
1955	28.92194
1960	27.11445
1965	25.93847
1970	25.33784
1975	24.57874
1980	25.08251
1985	24.5907
1990	24.29839
1995	24.5165
2000	25.48719
2005	27.60044
2010	28.55477
2015	28.94191
2020	28.2503
2025	27.72904
2030	26.71059
2035	26.0073
2040	25.76256
2045	24.79614
2050	24.18948
2055	23.82931
2060	23.6626
2065	23.72235
2070	23.87457
2075	23.90623
2080	23.64948
2085	23.33779
2090	23.0794
2095	22.90415
2100	22.78294