Year	Percent
1950	10.84129
1955	12.23082
1960	11.00888
1965	9.59805
1970	8.50805
1975	9.24851
1980	9.70873
1985	8.76125
1990	7.86723
1995	6.78653
2000	5.31305
2005	4.79866
2010	5.1816
2015	5.24533
2020	5.13967
2025	4.90953
2030	4.57158
2035	4.31499
2040	4.31908
2045	4.48849
2050	4.61473
2055	4.62161
2060	4.54265
2065	4.45942
2070	4.46305
2075	4.57078
2080	4.70155
2085	4.77221
2090	4.74317
2095	4.67081
2100	4.61189