1991

6.9

2004

6.0

1975

6.9

1987

7.0

2017

0.0

1978

0.0

2012

0.0

2013

6.8

2006

0.0

1987

0.0

2013

6.6

2002

8.1

2005

2.8

2005

8.1

1999

7.6

1967

7.4

1989

7.9

2006

7.7

0.0

2019

10.0