Year	Percent
1950	13.97066
1955	14.11688
1960	14.44047
1965	14.70331
1970	14.71001
1975	14.30739
1980	13.74936
1985	12.74538
1990	11.74037
1995	11.103
2000	10.42047
2005	10.10551
2010	9.50744
2015	9.09341
2020	8.79371
2025	8.22059
2030	7.75679
2035	7.37062
2040	7.01211
2045	6.67672
2050	6.38289
2055	6.11024
2060	5.865
2065	5.656
2070	5.48474
2075	5.32737
2080	5.19085
2085	5.07052
2090	4.96305
2095	4.87117
2100	4.79309