Year	Percent
1950	11.96754
1955	10.95951
1960	10.02141
1965	11.16184
1970	12.37283
1975	12.63405
1980	12.63444
1985	12.30699
1990	11.94592
1995	11.5333
2000	10.51194
2005	10.16317
2010	9.54997
2015	9.37407
2020	8.78194
2025	8.70817
2030	8.14925
2035	7.7052
2040	7.38719
2045	7.17646
2050	7.00096
2055	6.80463
2060	6.60194
2065	6.40803
2070	6.25092
2075	6.13244
2080	6.047
2085	5.95544
2090	5.86432
2095	5.77448
2100	5.69219