Year	Percent
1950	8.07642
1955	9.14823
1960	8.85399
1965	7.90125
1970	7.75893
1975	7.32089
1980	7.31956
1985	7.30448
1990	6.66979
1995	5.84261
2000	4.82329
2005	4.33166
2010	4.22485
2015	4.8704
2020	5.07287
2025	4.86351
2030	4.52419
2035	4.2346
2040	4.18726
2045	4.40337
2050	4.67773
2055	4.78905
2060	4.71071
2065	4.57911
2070	4.54117
2075	4.64179
2080	4.79882
2085	4.89503
2090	4.85798
2095	4.73717
2100	4.63049