Year	Percent
1950	16.85832
1955	19.00737
1960	19.11829
1965	17.67367
1970	16.69773
1975	15.87791
1980	13.75461
1985	13.52093
1990	12.09228
1995	13.08475
2000	12.73555
2005	11.08402
2010	10.0105
2015	9.78069
2020	9.47429
2025	8.94866
2030	8.35836
2035	7.80178
2040	7.33776
2045	6.98739
2050	6.6869
2055	6.4009
2060	6.11883
2065	5.87428
2070	5.66913
2075	5.50971
2080	5.38843
2085	5.28522
2090	5.18488
2095	5.09455
2100	5.02204