Year	Percent
1950	9.91971
1955	7.09352
1960	8.26471
1965	9.43525
1970	8.61557
1975	6.47745
1980	8.55904
1985	8.30787
1990	8.26873
1995	7.3395
2000	7.50306
2005	5.4684
2010	5.13738
2015	4.96426
2020	5.0802
2025	4.7902
2030	4.69687
2035	4.60809
2040	4.52714
2045	4.52538
2050	4.59869
2055	4.6389
2060	4.63762
2065	4.64333
2070	4.66014
2075	4.69863
2080	4.7479
2085	4.78549
2090	4.78637
2095	4.7645
2100	4.73718