Year	Percent
1950	10.09048
1955	9.67004
1960	9.94445
1965	9.88865
1970	10.91331
1975	10.8135
1980	10.84481
1985	11.29685
1990	12.32188
1995	11.44116
2000	10.53512
2005	10.14027
2010	9.89874
2015	9.50331
2020	8.89538
2025	8.21508
2030	7.93647
2035	7.47513
2040	7.00064
2045	6.54195
2050	6.16231
2055	5.86283
2060	5.64083
2065	5.45608
2070	5.3013
2075	5.15183
2080	5.04542
2085	4.96626
2090	4.92047
2095	4.89286
2100	4.86732