Figure 4.1: Trends for the abundance of butterflies of the wider countryside in woodland in England, 1990 to 2022

Updated 2 February 2024
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Trends for the abundance of butterflies of the wider countryside in woodland in England, 1990 to 2022
Year	Unsmoothed index (1990 = 100)	Smoothed index	Smoothed index lower 95% confidence interval	Smoothed index upper 95% confidence interval
1990	100	93.78	81.83	105.72
1991	90.78	90.33	80.12	100.53
1992	110.66	86.89	78.03	95.76
1993	55.72	83.5	75.59	91.4
1994	65.01	80.22	72.94	87.5
1995	86.9	77.07	70.14	83.99
1996	85.31	74.01	67.27	80.75
1997	94.62	71.03	64.37	77.7
1998	58.08	68.17	61.52	74.81
1999	49.89	65.5	58.86	72.14
2000	49.89	63.08	56.44	69.72
2001	48.19	60.95	54.31	67.58
2002	56.49	59.06	52.43	65.7
2003	70.79	57.38	50.76	64.01
2004	73.62	55.85	49.23	62.46
2005	55.85	54.43	47.83	61.04
2006	56.1	53.16	46.56	59.77
2007	36.73	52.06	45.46	58.67
2008	34.99	51.18	44.56	57.79
2009	55.08	50.49	43.87	57.12
2010	62.81	49.97	43.34	56.6
2011	55.46	49.56	42.92	56.2
2012	29.24	49.28	42.63	55.92
2013	57.41	49.12	42.48	55.76
2014	50.93	49.06	42.42	55.7
2015	49.09	49.07	42.4	55.74
2016	35.48	49.15	42.4	55.89
2017	46.67	49.27	42.34	56.2
2018	66.83	49.4	42.1	56.69
2019	58.08	49.46	41.54	57.39
2020	58.48	49.47	40.57	58.36
2021	39.63	49.42	39.17	59.67
2022	44.87	49.36	37.37	61.35

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