Year	Percent
1950	9.55183
1955	9.12261
1960	9.74911
1965	9.79513
1970	10.84188
1975	11.00539
1980	11.07253
1985	10.81059
1990	9.64761
1995	8.82113
2000	8.80325
2005	9.06698
2010	8.4921
2015	7.71854
2020	7.08957
2025	6.79353
2030	6.37033
2035	6.11846
2040	5.89404
2045	5.67441
2050	5.46269
2055	5.2966
2060	5.19188
2065	5.11131
2070	5.05673
2075	5.0055
2080	4.9622
2085	4.92093
2090	4.90392
2095	4.89043
2100	4.88021