Year	Percent
1950	5.04009
1955	5.07893
1960	5.13459
1965	5.16266
1970	5.15429
1975	5.11438
1980	5.03132
1985	4.89231
1990	5.08357
1995	4.93652
2000	4.78871
2005	4.63066
2010	4.49825
2015	4.43253
2020	4.43136
2025	4.56689
2030	4.84571
2035	5.28323
2040	5.90472
2045	6.73146
2050	7.63256
2055	8.4855
2060	9.31646
2065	10.29967
2070	11.44603
2075	12.65568
2080	13.83411
2085	14.98098
2090	16.11661
2095	17.26739
2100	18.4239