Year	Percent
1950	18.16423
1955	16.748
1960	17.54113
1965	17.85508
1970	17.78001
1975	17.58736
1980	17.57255
1985	17.79816
1990	17.4827
1995	16.54956
2000	15.00838
2005	15.35853
2010	15.95829
2015	15.06089
2020	13.91518
2025	12.93822
2030	12.28075
2035	11.80483
2040	11.25259
2045	10.56476
2050	9.84312
2055	9.22
2060	8.72672
2065	8.31415
2070	7.91523
2075	7.48687
2080	7.08008
2085	6.7261
2090	6.42595
2095	6.17985
2100	5.96368