Year	Percent
1950	9.50243
1955	9.75321
1960	8.92648
1965	9.15076
1970	9.59942
1975	10.26937
1980	12.60746
1985	10.85787
1990	10.49833
1995	9.10655
2000	9.38098
2005	9.18454
2010	9.04465
2015	7.89607
2020	6.24473
2025	6.5187
2030	6.48812
2035	6.32011
2040	6.11068
2045	5.82314
2050	5.51555
2055	5.3259
2060	5.31714
2065	5.35907
2070	5.3295
2075	5.24201
2080	5.14279
2085	5.07538
2090	5.0587
2095	5.075
2100	5.08132