Year	Percent
1950	14.34572
1955	14.30776
1960	15.15279
1965	15.66319
1970	13.37725
1975	12.9473
1980	11.6803
1985	12.2911
1990	10.80644
1995	10.57503
2000	9.08234
2005	7.99803
2010	7.13616
2015	6.88443
2020	6.55044
2025	6.19043
2030	5.78167
2035	5.38976
2040	5.14508
2045	5.09258
2050	5.09555
2055	5.03785
2060	4.93103
2065	4.82037
2070	4.74496
2075	4.72597
2080	4.7473
2085	4.76579
2090	4.7485
2095	4.70465
2100	4.6615