Year
|
Grassland butterflies (17 species)
|
Trend line
|
Lower confidence limits
|
Upper confidence limits
|
Confidence limits
|
1990
|
116.9740177
|
100
|
93.16512842
|
105.9293315
|
12.76420305
|
1991
|
89.34153628
|
96.07583866
|
89.99663554
|
102.3569876
|
12.36035209
|
1992
|
96.14159717
|
92.56054512
|
86.18043692
|
99.68956687
|
13.50912994
|
1993
|
63.39692341
|
89.50809421
|
82.38070462
|
98.19867917
|
15.81797455
|
1994
|
78.56699304
|
86.97289117
|
79.08091001
|
97.07681754
|
17.99590753
|
1995
|
91.14293759
|
84.87760842
|
76.34056054
|
96.15023902
|
19.80967848
|
1996
|
83.82707257
|
83.07862158
|
73.97186667
|
95.5449301
|
21.57306344
|
1997
|
89.298637
|
82.11384096
|
72.57334134
|
95.47687597
|
22.90353462
|
1998
|
77.73593424
|
82.10860615
|
72.21887512
|
96.07505481
|
23.85617969
|
1999
|
88.13509039
|
82.30043672
|
72.04084057
|
96.36913395
|
24.32829337
|
2000
|
84.26794792
|
81.92685219
|
71.52327668
|
96.62301321
|
25.09973653
|
2001
|
65.06388839
|
80.75057714
|
70.21453457
|
95.49211076
|
25.27757619
|
2002
|
74.78608398
|
79.12978418
|
68.06944863
|
93.70220825
|
25.63275961
|
2003
|
82.41824374
|
77.19516498
|
66.19005367
|
91.4290545
|
25.23900083
|
2004
|
81.25089279
|
74.74774506
|
63.72606682
|
89.21519149
|
25.48912467
|
2005
|
82.21920033
|
71.8295765
|
60.57459019
|
86.30656727
|
25.73197708
|
2006
|
80.12055972
|
68.93289078
|
58.00444742
|
83.4545447
|
25.45009728
|
2007
|
53.97150701
|
66.54991939
|
55.05730221
|
80.95560996
|
25.89830775
|
2008
|
46.28888636
|
64.51841543
|
52.69076455
|
79.39370634
|
26.70294179
|
2009
|
60.88795611
|
62.57554446
|
50.14047873
|
77.77727152
|
27.63679279
|
2010
|
62.14966618
|
61.0626566
|
47.97461743
|
76.11724371
|
28.14262628
|
2011
|
65.83926505
|
59.98282181
|
46.4146717
|
75.28816994
|
28.87349824
|
2012
|
57.3815504
|
59.16238547
|
45.26068028
|
75.32750942
|
30.06682914
|
2013
|
66.51836832
|
58.67761091
|
44.25060344
|
75.05727112
|
30.80666767
|
2014
|
56.25560905
|
58.60476142
|
43.48035779
|
75.66023255
|
32.17987476
|
2015
|
54.35427676
|
58.95667654
|
43.349097
|
76.58744063
|
33.23834362
|
2016
|
58.54477022
|
59.67786369
|
43.41957879
|
77.92810469
|
34.5085259
|
2017
|
62.91451571
|
60.74208807
|
43.56535268
|
79.59209434
|
36.02674166
|