Year	Percent
1950	19.52336
1955	18.06247
1960	18.54003
1965	19.21312
1970	19.71235
1975	19.95399
1980	20.08226
1985	19.92369
1990	19.02272
1995	18.76749
2000	18.61932
2005	18.32382
2010	18.28577
2015	16.77437
2020	16.17416
2025	15.45233
2030	14.61851
2035	13.72127
2040	12.8847
2045	12.12499
2050	11.4182
2055	10.78092
2060	10.18396
2065	9.62805
2070	9.10285
2075	8.61508
2080	8.16856
2085	7.75959
2090	7.3766
2095	7.04447
2100	6.74633