Year	Percent
1950	7.34162
1955	9.03975
1960	8.86721
1965	8.05897
1970	7.3262
1975	6.63087
1980	6.75193
1985	6.53335
1990	6.39936
1995	5.89113
2000	5.11108
2005	5.19123
2010	4.49517
2015	4.8153
2020	4.63209
2025	4.34889
2030	4.16223
2035	4.08583
2040	4.06971
2045	4.13905
2050	4.23068
2055	4.23857
2060	4.18295
2065	4.15691
2070	4.19217
2075	4.27148
2080	4.35966
2085	4.41303
2090	4.41036
2095	4.3852
2100	4.38002