1981

7.1

2007

6.1

2006

6.8

1991

6.2

1990

6.7

1993

5.5

2019

7.3

1988

7.0

2002

5.7

2001

6.1

1993

6.7

2008

7.1

2001

5.7

2000

4.8

1994

7.4

1994

4.4

2008

6.8

1983

3.9

2016

0.5

1990

6.2