1990

5.5

1998

5.5

1999

6.0

1977

6.3

2008

8.0

2000

7.1

1980

6.9

1985

5.8

1980

6.4

2018

6.2

2016

7.3

2017

8.2

2023

6.4

1978

5.8

2011

5.3

1977

4.5

2004

6.4

1990

0.0