1991

7.6

2001

7.5

1998

6.6

2001

7.4

2011

2.9

2013

7.0

2000

5.0

2016

6.4

2013

7.1

1998

6.8

2005

6.6

2005

5.6

2007

6.2

2006

5.5

1976

7.8

2007

6.5

1986

6.5

1988

7.4

1991

7.4

2023

0.0