Year	Percent
1950	11.47998
1955	11.61465
1960	11.96334
1965	11.45173
1970	11.48839
1975	11.31086
1980	10.68031
1985	10.0437
1990	9.83996
1995	11.95122
2000	11.13886
2005	10.2287
2010	8.47025
2015	7.04299
2020	6.52452
2025	6.66212
2030	6.86103
2035	6.38016
2040	5.73758
2045	5.29283
2050	5.10775
2055	5.14105
2060	5.21603
2065	5.16277
2070	4.97923
2075	4.77176
2080	4.65804
2085	4.6624
2090	4.71866
2095	4.74397
2100	4.70979