Year	Percent
1950	7.30066
1955	8.14218
1960	8.68818
1965	9.10877
1970	8.36422
1975	6.07442
1980	5.449
1985	5.67983
1990	5.85993
1995	5.32015
2000	5.07359
2005	4.62958
2010	4.3929
2015	4.49353
2020	4.655
2025	4.72206
2030	4.60047
2035	4.41213
2040	4.29503
2045	4.30429
2050	4.43074
2055	4.57398
2060	4.64197
2065	4.61564
2070	4.55118
2075	4.51453
2080	4.54638
2085	4.60404
2090	4.6455
2095	4.63504
2100	4.57682