Year	Percent
1950	4.71432
1955	4.46369
1960	4.23966
1965	4.13308
1970	3.84956
1975	3.85213
1980	4.02893
1985	3.95436
1990	4.18832
1995	4.60116
2000	4.43438
2005	4.43565
2010	4.47131
2015	4.30939
2020	4.19262
2025	4.18755
2030	4.37506
2035	4.82239
2040	5.55458
2045	6.48135
2050	7.72378
2055	9.03183
2060	10.3772
2065	11.76186
2070	13.31031
2075	14.66587
2080	16.07641
2085	17.5215
2090	18.97481
2095	20.39659
2100	21.78977