Year	Percent
1950	7.57117
1955	8.28181
1960	10.72686
1965	11.79818
1970	11.557
1975	9.9367
1980	8.91204
1985	8.7671
1990	9.05661
1995	9.41702
2000	8.32354
2005	6.59888
2010	6.07019
2015	6.97313
2020	7.61645
2025	7.0322
2030	6.41315
2035	6.01802
2040	5.97811
2045	6.16229
2050	6.29551
2055	6.15959
2060	5.85416
2065	5.60877
2070	5.53919
2075	5.58851
2080	5.62324
2085	5.54785
2090	5.37531
2095	5.21608
2100	5.15012