Year	Percent
1950	4.10819
1955	3.92698
1960	3.85764
1965	3.83709
1970	3.86315
1975	3.82515
1980	3.74842
1985	3.64495
1990	3.67643
1995	3.56463
2000	3.47248
2005	3.36789
2010	3.28715
2015	3.58271
2020	3.80152
2025	4.00672
2030	4.20396
2035	4.47433
2040	4.82503
2045	5.17918
2050	5.58779
2055	6.02187
2060	6.52161
2065	7.1914
2070	8.02921
2075	8.90127
2080	9.76157
2085	10.63693
2090	11.55155
2095	12.50318
2100	13.48277