Year	Percent
1950	15.69288
1955	16.10762
1960	16.15268
1965	15.80832
1970	15.14973
1975	14.39131
1980	13.57709
1985	12.71274
1990	11.84093
1995	11.87271
2000	12.37751
2005	13.03501
2010	13.77646
2015	14.2568
2020	14.87671
2025	15.91179
2030	17.10577
2035	18.1252
2040	18.92929
2045	19.54342
2050	20.23787
2055	21.17566
2060	22.06408
2065	22.78252
2070	23.26501
2075	23.57179
2080	23.90952
2085	24.2905
2090	24.66853
2095	24.96258
2100	25.15995