Year	Percent
1950	10.05804
1955	11.67141
1960	11.82073
1965	12.07642
1970	11.31247
1975	9.82992
1980	9.36444
1985	8.76884
1990	8.45405
1995	8.1906
2000	8.35477
2005	7.34521
2010	6.72318
2015	7.22395
2020	6.66392
2025	6.37491
2030	6.1062
2035	5.81226
2040	5.58011
2045	5.45975
2050	5.39236
2055	5.3023
2060	5.17692
2065	5.05945
2070	4.96348
2075	4.90087
2080	4.87026
2085	4.84349
2090	4.80466
2095	4.75262
2100	4.70842