*Excludes Observations that spanned multiple years

Pre 19706
19701
19711
19721
19731
19740
19750
19761
19770
19781
19791
19806
19811
19821
19839
19842
19854
198663
198743
198827
198936
199063
1991128
199264
1993140
199471
1995110
199654
1997100
199886
199938
200051
200157
200240
200311
200480
200593
200620
200721
200831
200918
201020
201123
20120
20135
20148
20155
201620
20178
20180
Total1570