2016

7.0

2018

6.2

1989

5.5

1996

5.8

1992

6.8

2002

5.2

1995

4.6

1969

6.6

2004

4.7

2015

8.4

1977

6.7

2008

5.4

2009

5.9

1995

5.6

1941

6.4

2003

6.8

1989

7.1

2009

6.1

1995

7.8

2008

7.0