Figure 5.1: Trends for the abundance of all species of butterflies resident in England, 1976 to 2022


Trends for the abundance of all species of butterflies resident in England, 1976 to 2022
Year	Unsmoothed index (1990 = 100)	Smoothed index	Smoothed index lower 95% confidence interval	Smoothed index upper 95% confidence interval
1976	100	68.03	58.66	77.41
1977	40.36	68.31	59.92	76.7
1978	56.75	68.61	61.06	76.15
1979	69.34	68.93	62.09	75.77
1980	63.53	69.27	62.99	75.56
1981	45.5	69.63	63.77	75.5
1982	78.89	70	64.44	75.56
1983	73.62	70.35	65	75.71
1984	97.5	70.67	65.44	75.89
1985	69.82	70.94	65.79	76.08
1986	66.68	71.15	66.04	76.26
1987	65.31	71.32	66.23	76.41
1988	56.75	71.44	66.36	76.52
1989	75.51	71.5	66.42	76.58
1990	80.35	71.49	66.41	76.58
1991	73.96	71.4	66.31	76.48
1992	94.19	71.21	66.13	76.29
1993	62.66	70.92	65.84	76
1994	68.23	70.55	65.47	75.62
1995	81.1	70.09	65.02	75.16
1996	79.8	69.55	64.48	74.61
1997	84.53	68.94	63.88	74
1998	59.16	68.27	63.21	73.33
1999	58.61	67.57	62.51	72.63
2000	60.67	66.87	61.81	71.92
2001	58.61	66.17	61.11	71.23
2002	57.54	65.49	60.42	70.55
2003	70.63	64.83	59.76	69.9
2004	72.95	64.2	59.12	69.27
2005	66.22	63.59	58.51	68.67
2006	71.78	63.02	57.94	68.11
2007	46.88	62.51	57.42	67.59
2008	43.65	62.06	56.97	67.14
2009	60.53	61.69	56.6	66.77
2010	72.78	61.39	56.3	66.47
2011	68.39	61.15	56.06	66.24
2012	38.02	60.98	55.88	66.09
2013	63.83	60.89	55.74	66.04
2014	64.12	60.86	55.63	66.09
2015	59.02	60.9	55.53	66.26
2016	45.6	60.98	55.41	66.55
2017	53.95	61.12	55.25	67
2018	74.99	61.29	55	67.59
2019	72.95	61.48	54.62	68.34
2020	68.08	61.67	54.11	69.23
2021	61.09	61.86	53.45	70.27
2022	62.09	62.05	52.65	71.46

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