Year	Percent
1950	14.79117
1955	14.30759
1960	13.03267
1965	13.65127
1970	14.69592
1975	15.29319
1980	16.82494
1985	15.48641
1990	15.64446
1995	13.20542
2000	12.9505
2005	12.66367
2010	12.18181
2015	12.02624
2020	11.74648
2025	10.76777
2030	9.94108
2035	9.25989
2040	8.78775
2045	8.41251
2050	8.00198
2055	7.54186
2060	7.07011
2065	6.69119
2070	6.39339
2075	6.16422
2080	5.94939
2085	5.72742
2090	5.51331
2095	5.33765
2100	5.20984