Year	Percent
1950	6.97396
1955	6.57201
1960	7.18519
1965	8.43321
1970	8.9933
1975	9.3264
1980	8.72743
1985	7.49124
1990	6.78548
1995	6.59456
2000	6.7911
2005	7.00247
2010	6.90136
2015	6.44599
2020	6.20377
2025	6.08337
2030	5.64413
2035	5.73668
2040	5.82626
2045	5.80615
2050	5.7236
2055	5.62365
2060	5.54504
2065	5.51777
2070	5.53431
2075	5.52783
2080	5.47745
2085	5.41092
2090	5.35405
2095	5.32698
2100	5.31195