1997

6.1

1968

6.4

2013

6.1

1994

6.7

1990

6.5

2019

6.9

2016

4.5

1999

7.6

2003

5.3

2008

7.3

1993

7.1

2011

6.3

2014

7.0

2010

6.7

1993

7.6

1991

5.3

1993

5.8

2015

6.8

2011

6.5

2011

6.1