Year	Percent
1950	10.68689
1955	8.64017
1960	7.96202
1965	7.45341
1970	7.30566
1975	6.99325
1980	6.57266
1985	6.08606
1990	6.29574
1995	5.95916
2000	5.75374
2005	5.72712
2010	5.67445
2015	5.59846
2020	5.64688
2025	5.83777
2030	6.11857
2035	6.45864
2040	6.86887
2045	7.35159
2050	7.92615
2055	8.6121
2060	9.3836
2065	10.21331
2070	11.12817
2075	12.08936
2080	13.05615
2085	14.04135
2090	15.04681
2095	16.07098
2100	17.12609