Year	Percent
1950	9.88249
1955	10.05475
1960	9.13087
1965	10.23814
1970	11.8476
1975	12.81988
1980	11.73862
1985	9.15726
1990	8.23231
1995	6.24704
2000	6.25909
2005	6.56498
2010	6.78596
2015	6.14594
2020	5.46055
2025	4.94087
2030	4.57405
2035	4.34348
2040	4.18432
2045	4.12922
2050	4.03073
2055	3.91826
2060	3.83619
2065	3.80192
2070	3.80164
2075	3.81635
2080	3.81558
2085	3.79145
2090	3.75481
2095	3.73389
2100	3.71599