Year	annual %
1961	2.185955052537158
1962	2.124262008969329
1963	1.9503245768300017
1964	1.9430729660748527
1965	1.9390087959646707
1966	1.8702555948928545
1967	0.7580294787349461
1968	0.5853106641449348
1969	0.4168952881111399
1970	-1.2113119164814934
1971	-3.505745716571529
1972	-2.8503392358637605
1973	-3.242386723218588
1974	-4.320076422471507
1975	27.02658149073731
1976	-6.818404253702259
1977	-4.709571546974358
1978	-1.7308850945622627
1979	1.0617697123104965
1980	-1.8338754372259753
1981	-0.5723203474379045
1982	3.6001103562088486
1983	3.54677205519131
1984	3.2475296036237595
1985	2.984835698562225
1986	3.4320238321997687
1987	3.649936680520299
1988	3.242212928378692
1989	3.190707144447286
1990	3.4930148225033335
1991	3.4324302729537197
1992	4.423289941506471
1993	4.842320972336346
1994	3.331633417260952
1995	2.1870679137055293
1996	1.9298367312451583
1997	1.7428299377607248
1998	1.6956891357272286
1999	1.8103019183417262
2000	1.688261596835839
2001	1.6500036873354706
2002	1.6519070890215843
2003	1.6383465399296235
2004	1.6266682375606185
2005	1.6060480451040349
2006	1.5829320935412727
2007	1.594463289811654
2008	1.4603846539950398
2009	1.060533374061832
2010	1.0015929688754988
2011	0.9898442825786354
2012	0.9767679278156184
2013	0.9506420949854683
2014	0.9079335717592056
2015	0.8511126398410236
2016	0.8264465598977669
2017	0.7950707032442219
2018	0.6902995986923207
2019	0.5866565095189049
2020	0.5980787667725261
2021	0.5880336117144819
2022	0.4783591399295615
2023	0.43917937155039344