Year	Percent
1950	10.6026
1955	11.04747
1960	11.47335
1965	10.98464
1970	9.98173
1975	10.24384
1980	10.43835
1985	10.36554
1990	10.21035
1995	10.30539
2000	10.27926
2005	9.90393
2010	10.01184
2015	10.42106
2020	10.74343
2025	10.91666
2030	10.94268
2035	10.95884
2040	11.00325
2045	11.01107
2050	10.96246
2055	10.85046
2060	10.68041
2065	10.45832
2070	10.20208
2075	9.9139
2080	9.60448
2085	9.26506
2090	8.95803
2095	8.62136
2100	8.31342