Year	annual %
1961	3.388707854261626
1962	3.3726711567636967
1963	3.3784764762225743
1964	2.9876685419660842
1965	2.957517309637162
1966	2.93387983935595
1967	2.934591910243463
1968	2.920408439337701
1969	2.834800401057132
1970	2.7583469177057975
1971	2.6844340005029133
1972	2.5901062060631506
1973	2.517751792304483
1974	2.4268476965282835
1975	2.366109109852116
1976	2.3503747745071335
1977	2.326854990605766
1978	2.3460888166435536
1979	2.3837912587837136
1980	2.332459087843702
1981	2.0639573587479307
1982	1.4799320569538528
1983	1.3271735194464331
1984	1.2777684448503
1985	1.2891277551406943
1986	1.3065356649383075
1987	1.3137548193722104
1988	1.2739869716839514
1989	1.2036274761720147
1990	1.1625659408738154
1991	1.1466633535186181
1992	1.0999706391663808
1993	1.0537527159209676
1994	0.952191719752673
1995	0.83522806824913
1996	0.7074607786041747
1997	0.6072903012688161
1998	0.5166328069382483
1999	0.5073102217192247
2000	0.4789060559023762
2001	0.6818582987395538
2002	0.9143016763964327
2003	0.9203165471777531
2004	0.8835281682525058
2005	0.8493837460255088
2006	0.913555096671776
2007	0.9535414320807922
2008	0.9434817953478525
2009	0.8834241172763465
2010	0.8166406947780971
2011	0.8384336395271292
2012	0.6693410627465727
2013	0.554824165905238
2014	0.6182034088770829
2015	0.6651467456745414
2016	0.7161297500724445
2017	0.7767174779230789
2018	1.255074242493626
2019	1.200113164554299
2020	1.2169705701304516
2021	1.8579517591216814
2022	0.9890804033926436
2023	0.3163356843815346