Year	Percent
1950	6.79785
1955	6.33363
1960	6.01945
1965	5.64347
1970	5.15025
1975	4.63577
1980	4.21853
1985	3.92649
1990	4.26013
1995	4.29814
2000	4.2022
2005	4.0123
2010	4.12007
2015	4.4954
2020	4.94721
2025	5.47598
2030	6.13773
2035	7.08986
2040	8.35813
2045	9.84814
2050	11.33252
2055	12.58675
2060	14.07652
2065	15.70079
2070	17.4378
2075	18.99912
2080	20.52628
2085	22.0397
2090	23.5573
2095	25.05135
2100	26.48371