Year	Percent
1950	18.08644
1955	19.34543
1960	16.76137
1965	15.26468
1970	12.38577
1975	10.45585
1980	9.2315
1985	10.72521
1990	9.61219
1995	8.49152
2000	8.13054
2005	6.73687
2010	7.0195
2015	5.79471
2020	5.81861
2025	6.05427
2030	6.28708
2035	6.19928
2040	5.86569
2045	5.53452
2050	5.41044
2055	5.4997
2060	5.5979
2065	5.54964
2070	5.36676
2075	5.15554
2080	5.0409
2085	5.03586
2090	5.08853
2095	5.10089
2100	5.04149