Year	Percent
1950	13.79965
1955	16.79606
1960	14.58003
1965	15.87549
1970	16.31789
1975	13.66044
1980	10.12409
1985	9.89769
1990	11.36341
1995	8.32926
2000	6.37138
2005	5.99787
2010	6.07326
2015	6.14767
2020	5.67456
2025	5.09247
2030	4.71869
2035	4.55559
2040	4.55012
2045	4.59498
2050	4.57465
2055	4.47952
2060	4.38588
2065	4.36629
2070	4.42243
2075	4.51008
2080	4.56489
2085	4.56466
2090	4.53082
2095	4.50326
2100	4.51003