2015

6.1

2020

6.7

2013

6.6

1969

7.6

1998

7.8

1999

7.7

2001

5.9

1989

7.1

1980

7.1

2008

8.0

2000

7.3

1999

5.6

2009

6.3

1983

6.3

1993

6.5

2004

6.7

2001

7.0

2013

6.1

1973

6.9

2009

5.4