1988

5.3

1991

5.2

1990

5.0

1996

5.1

1997

4.3

2019

5.8

1989

5.8

1990

6.4

2018

4.5

1988

6.2

1991

6.9

1987

7.5

1994

6.0

2017

5.4

1993

7.8

1976

7.4

1989

7.0

1985

7.5

2002

6.6

2020

8.1