Year	Percent
1950	13.50089
1955	13.81035
1960	14.48496
1965	11.9199
1970	10.61491
1975	9.23557
1980	9.38627
1985	10.96487
1990	10.45945
1995	9.38264
2000	9.08218
2005	5.93956
2010	4.21658
2015	4.78446
2020	4.86813
2025	4.24085
2030	3.93292
2035	3.95339
2040	4.07027
2045	4.10456
2050	4.0233
2055	3.93176
2060	3.9187
2065	3.96558
2070	4.03412
2075	4.07764
2080	4.10218
2085	4.11241
2090	4.14699
2095	4.19893
2100	4.25688