Year	Percent
1950	10.08732
1955	9.88191
1960	10.43784
1965	10.47243
1970	10.0191
1975	9.70627
1980	8.83318
1985	6.91457
1990	5.63452
1995	5.15112
2000	4.84955
2005	5.19671
2010	5.49019
2015	4.91165
2020	4.47983
2025	4.14041
2030	4.02522
2035	4.1241
2040	4.31572
2045	4.44006
2050	4.40513
2055	4.31117
2060	4.28405
2065	4.3612
2070	4.51084
2075	4.65536
2080	4.71195
2085	4.6749
2090	4.59545
2095	4.5471
2100	4.54753