Year	Percent
1950	12.25519
1955	13.31471
1960	13.10572
1965	12.36573
1970	10.45707
1975	9.64093
1980	8.87157
1985	8.79065
1990	8.37997
1995	7.45631
2000	6.7757
2005	6.53841
2010	6.36552
2015	5.91823
2020	5.5434
2025	5.27695
2030	5.08915
2035	4.94656
2040	4.85532
2045	4.76934
2050	4.67393
2055	4.58411
2060	4.51924
2065	4.48827
2070	4.47896
2075	4.47351
2080	4.46535
2085	4.45436
2090	4.4489
2095	4.45445
2100	4.46245