1990

4.5

1998

7.1

2005

6.9

2005

6.5

2005

7.2

1977

7.7

2001

6.6

2008

5.6

1987

6.3

1994

6.8

2005

5.8

1981

7.1

1978

4.7

2022

0.0

1995

7.3

1982

7.2

1992

7.2

1996

7.0

2015

7.6

2019

6.2