Year	Percent
1950	11.34259
1955	10.74429
1960	10.08448
1965	11.86907
1970	11.49566
1975	11.24342
1980	11.31181
1985	11.46153
1990	11.74594
1995	11.97635
2000	11.9604
2005	12.2838
2010	12.18413
2015	11.13478
2020	9.85494
2025	8.2772
2030	7.92027
2035	7.5402
2040	7.00272
2045	6.3445
2050	5.79918
2055	5.4638
2060	5.23268
2065	5.03897
2070	4.85247
2075	4.69132
2080	4.5801
2085	4.52144
2090	4.5103
2095	4.51249
2100	4.50934