Year	annual %
1961	11.628865979381443
1962	6.649427410417437
1963	19.29338413578109
1964	16.202090592334496
1965	6.434282858570714
1966	1.537739171264233
1967	5.953757225433526
1968	3.055100927441353
1969	5.738485971413446
1970	5.407029137879243
1971	3.0208036477628952
1972	15.749193176579068
1973	22.377121006930615
1974	30.217419606822027
1975	21.465706858628273
1976	25.977446703432385
1977	34.03462920614178
1978	27.027883396704688
1979	31.325671086209873
1980	51.41942930613796
1981	30.897564552858082
1982	31.152096832452436
1983	22.625718734016424
1984	18.847973158792144
1985	18.30438924305708
1986	20.950595752310473
1987	20.958864972966563
1988	21.547559627794215
1989	17.497974283482986
1990	28.73037047438508
1991	19.338898867743413
1992	19.428237150874583
1993	13.249009088071894
1994	11.214676771764996
1995	9.896515194583436
1996	10.835903992411206
1997	10.771963958570648
1998	10.776409714941964
1999	5.663641739210568
2000	11.581321657017632
2001	13.21525123448654
2002	12.630372035145584
2003	21.279759624413146
2004	16.239251112764975
2005	11.489354344763303
2006	15.002112576359439
2007	19.114248817707793
2008	10.482895270235993
2009	9.472592098116989
2010	12.418513340648177
2011	6.664885736469928
2012	12.347304786984289
2013	18.89071658163956
2014	15.766385207881358
2015	18.604964444613753
2016	39.50914199379449
2017	20.4504936953442
2018	13.302139823035859
2019	13.278510845867633
2020	19.70578639573468
2021	18.3339089698408
2022	27.136974960427835
2023	19.923071075138328