Year	Percent
1950	6.57284
1955	7.37547
1960	7.89653
1965	8.36839
1970	7.72417
1975	5.62798
1980	5.06451
1985	5.29548
1990	5.50868
1995	5.02506
2000	4.81101
2005	4.40703
2010	4.19139
2015	4.30534
2020	4.46913
2025	4.54139
2030	4.43244
2035	4.25817
2040	4.15044
2045	4.16308
2050	4.28905
2055	4.4322
2060	4.50411
2065	4.48436
2070	4.42527
2075	4.39096
2080	4.423
2085	4.48107
2090	4.52387
2095	4.5155
2100	4.46042