Year	Percent
1950	10.59647
1955	11.12767
1960	10.86452
1965	13.17586
1970	12.70068
1975	10.18436
1980	8.32097
1985	7.95239
1990	7.75066
1995	8.17428
2000	7.63934
2005	6.66039
2010	5.14293
2015	5.14987
2020	4.48054
2025	4.55847
2030	4.3127
2035	4.29797
2040	4.23772
2045	4.17518
2050	3.88425
2055	3.62371
2060	3.50292
2065	3.48826
2070	3.50903
2075	3.50042
2080	3.4625
2085	3.42317
2090	3.4294
2095	3.50732
2100	3.61962