Year	Percent
1950	18.83766
1955	18.67672
1960	18.67219
1965	18.4563
1970	17.25749
1975	16.93568
1980	16.85606
1985	16.73268
1990	16.21247
1995	15.57167
2000	15.30938
2005	14.16583
2010	14.39641
2015	13.13364
2020	12.41231
2025	11.67911
2030	11.05561
2035	10.53506
2040	10.0366
2045	9.56199
2050	9.09832
2055	8.63657
2060	8.21993
2065	7.83319
2070	7.48836
2075	7.15324
2080	6.84082
2085	6.5531
2090	6.30027
2095	6.06956
2100	5.86637