Year	Percent
1950	10.92019
1955	10.17666
1960	10.18413
1965	12.7101
1970	13.99677
1975	12.57844
1980	9.81942
1985	8.84255
1990	7.07638
1995	6.76926
2000	7.45839
2005	7.04809
2010	6.72621
2015	5.83611
2020	5.21654
2025	4.93288
2030	4.6594
2035	4.46485
2040	4.38018
2045	4.24992
2050	4.1112
2055	4.00749
2060	3.95558
2065	3.93929
2070	3.93759
2075	3.9222
2080	3.88547
2085	3.8407
2090	3.81397
2095	3.79474
2100	3.78246