2018

6.1

2020

5.6

1990

7.7

1971

7.5

2016

3.8

2002

7.7

2004

8.0

2005

7.8

2007

7.7

2009

7.7

1992

7.4

1994

6.8

1988

6.8

2006

5.1

1998

6.0

2006

5.5

2000

6.8

1995

6.2

2003

6.7

1999

2.0