*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19731
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19840
19850
19861
19877
198813
19892
19902
19912
19924
19937
19947
199536
199639
199758
199815
19998
20005
20014
20023
200310
20043
20051
20062
20072
20080
20090
20100
20110
20120
20133
20140
20154
20160
20170
20180
20191
20202
20212
20222
20234
20249
Total263