4.50
Baseline period
4.25
4.00
3.75
3.50
Average count
1961-1990
baseline
3.25
1970
1980
1990
2000
2010
2020
4.50
Baseline period
4.25
4.00
3.75
3.50
Average count
1961-1990
baseline
3.25
1970
1980
1990
2000
2010
2020
4.50
Baseline period
4.25
4.00
3.75
3.50
Average count
1961-1990
baseline
3.25
1970
1980
1990
2000
2010
2020
4.50
Baseline period
4.25
4.00
3.75
3.50
Average count
1961-1990
baseline
3.25
1970
1980
1990
2000
2010
2020