Year	annual %
1961	2.134063078050881
1962	2.2203505888215647
1963	2.333011960638677
1964	2.4373007659646015
1965	2.6608489377427267
1966	3.301915055864056
1967	4.422377905057177
1968	4.579282988976775
1969	4.610248071544985
1970	4.55879056561628
1971	4.5075399548703015
1972	4.479615426238432
1973	4.477422727502707
1974	4.4908718217138075
1975	4.431671869813249
1976	3.995857415682267
1977	3.9351812274230027
1978	3.840291365808074
1979	3.74819637513059
1980	3.680579265578379
1981	3.6603578062945292
1982	3.6608437674337373
1983	3.662560059522945
1984	3.858361197928096
1985	4.219374504688369
1986	4.158527073615846
1987	4.053187375656146
1988	3.912098787481818
1989	3.7388737448664418
1990	3.6161497516640004
1991	3.5312745031446857
1992	3.424875007749781
1993	3.298663233964641
1994	3.0111018201109654
1995	2.283850304784224
1996	2.0995499633714076
1997	1.9734637330660492
1998	1.8654454037719739
1999	1.7602139645331953
2000	1.6846799740774372
2001	1.6304808671841322
2002	1.5898499027160569
2003	1.5730496662461593
2004	1.5244863114363336
2005	1.3704726301115115
2006	1.3513474558848957
2007	1.353466728835161
2008	1.3711971272339636
2009	1.3974464163869917
2010	1.4424016446595782
2011	1.6745074710465369
2012	1.695015343686759
2013	1.5316393855037893
2014	1.5417191633646934
2015	1.5390990703199432
2016	1.525648852693002
2017	1.5027344855064053
2018	1.4646742129194898
2019	1.416846561737205
2020	1.3809554238851944
2021	1.287799280494106
2022	1.2222775640934678
2023	1.291856786837597