1997

7.1

2014

4.2

1998

7.2

2005

5.6

2007

6.4

2023

0.0

2005

6.7

1990

6.2

1987

6.4

2001

7.4

1991

7.6

2003

6.5

1981

7.0

1995

7.3

2000

6.2

2004

7.1

2011

6.9

1997

5.0

2002

4.1

2016

4.5