Year	Percent
1950	16.4554
1955	16.47181
1960	17.07719
1965	18.41673
1970	16.93409
1975	15.94371
1980	15.58332
1985	14.54242
1990	13.10653
1995	10.646
2000	8.83511
2005	8.11033
2010	8.35024
2015	9.4007
2020	8.66983
2025	7.67942
2030	6.76563
2035	6.2429
2040	6.18608
2045	6.2948
2050	6.2405
2055	5.94323
2060	5.55473
2065	5.28789
2070	5.21134
2075	5.2423
2080	5.25221
2085	5.16941
2090	5.01667
2095	4.88395
2100	4.82955