Year	Percent
1950	18.63813
1955	18.32228
1960	18.77785
1965	19.29461
1970	17.39885
1975	15.31974
1980	14.91383
1985	14.3538
1990	13.91746
1995	12.63476
2000	11.52962
2005	10.77685
2010	10.16012
2015	9.54829
2020	8.89539
2025	8.27195
2030	7.73138
2035	7.25196
2040	6.8428
2045	6.49232
2050	6.17139
2055	5.89711
2060	5.65974
2065	5.46236
2070	5.29694
2075	5.15745
2080	5.03998
2085	4.94369
2090	4.86026
2095	4.7971
2100	4.74915