Year	Percent
1950	10.89922
1955	14.03569
1960	13.76886
1965	14.22517
1970	14.00113
1975	13.95374
1980	13.43923
1985	13.62673
1990	13.99065
1995	14.23556
2000	12.29607
2005	10.88961
2010	10.84059
2015	10.64476
2020	12.18238
2025	10.95592
2030	9.88148
2035	9.24221
2040	9.12034
2045	9.09138
2050	8.74226
2055	8.25659
2060	7.79513
2065	7.45326
2070	7.22677
2075	6.99295
2080	6.71932
2085	6.42697
2090	6.16617
2095	5.95678
2100	5.79398