Year	Percent
1950	12.53898
1955	12.5351
1960	13.71373
1965	13.58528
1970	13.28405
1975	12.84019
1980	11.50836
1985	10.45184
1990	10.21089
1995	10.26152
2000	9.41256
2005	8.39739
2010	7.59377
2015	7.20273
2020	6.67702
2025	6.35174
2030	6.05348
2035	5.76451
2040	5.49022
2045	5.27264
2050	5.127
2055	5.01366
2060	4.93157
2065	4.85605
2070	4.79166
2075	4.73353
2080	4.7081
2085	4.69574
2090	4.69102
2095	4.68654
2100	4.66745