*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19841
19850
19860
19870
198835
19893
19905
199115
19927
199325
199412
19958
19960
19977
19980
199911
20005
20011
20026
20031
20041
20050
20060
20070
20088
20096
20101
20110
20120
20139
20141
20153
20160
20171
20185
20191
20201
20213
20220
20233
20240
Total187