Year	Percent
1950	10.48678
1955	10.35741
1960	10.20439
1965	9.64123
1970	11.10201
1975	10.69067
1980	10.32294
1985	10.31507
1990	10.50108
1995	10.84345
2000	10.50298
2005	10.14152
2010	10.55349
2015	11.82839
2020	11.64201
2025	10.25138
2030	8.71817
2035	8.39232
2040	8.04676
2045	7.5055
2050	6.82222
2055	6.24867
2060	5.89836
2065	5.65343
2070	5.43919
2075	5.22755
2080	5.04089
2085	4.90875
2090	4.83198
2095	4.80289
2100	4.78506