1981

6.4

1992

6.8

1999

6.8

2000

4.8

1988

4.4

2017

6.0

2007

5.0

2001

4.4

2020

4.1

2022

6.2

2003

7.2

1990

7.4

1990

7.0

1994

5.5

1991

8.0

2007

3.7

2013

3.5

2005

5.2

2006

6.2

2006

7.1