Year	Percent
1950	13.23473
1955	14.08345
1960	13.14632
1965	13.25777
1970	13.8465
1975	15.10387
1980	15.0458
1985	16.07766
1990	16.50328
1995	16.62064
2000	16.67558
2005	14.81561
2010	13.84766
2015	13.33471
2020	12.96443
2025	12.15894
2030	11.25561
2035	10.40893
2040	9.67566
2045	9.01277
2050	8.40213
2055	7.83014
2060	7.2614
2065	6.75514
2070	6.33815
2075	5.99899
2080	5.73039
2085	5.51708
2090	5.34079
2095	5.19564
2100	5.08009