*Excludes Observations that spanned multiple years

Pre 19702
19700
19711
19720
19730
19740
19750
19760
19771
19780
19790
19800
19810
19820
19830
19840
19850
19860
19874
19884
19890
19900
19912
199242
199315
19946
199513
19968
19970
19982
19998
200025
20013
20020
20030
20040
20050
20061
20070
20081
20091
20101
20115
20120
20130
20141
20151
20161
20170
20183
20190
20200
20211
20224
20233
20240
Total159