Year	Percent
1950	10.34927
1955	10.1684
1960	10.17886
1965	10.25079
1970	10.62027
1975	11.00393
1980	10.98301
1985	11.38192
1990	10.44158
1995	9.18154
2000	8.43965
2005	7.7073
2010	8.26693
2015	7.3484
2020	7.18994
2025	6.04945
2030	5.13188
2035	4.92712
2040	4.97483
2045	5.07681
2050	5.01681
2055	4.81088
2060	4.58508
2065	4.48855
2070	4.56012
2075	4.69216
2080	4.76781
2085	4.75512
2090	4.70106
2095	4.68356
2100	4.73262