2015

7.8

1997

7.6

2004

5.7

1999

7.6

2010

7.7

1987

7.4

2009

6.8

1964

7.2

2010

5.9

2002

6.1

1990

5.1

2000

6.0

2014

5.8

1990

5.9

1998

7.5

1994

5.2

2006

5.8

1996

5.9

2016

4.5

1979

7.1