THE STABILITY OF THE SYSTEM

6.5

/

1996

8

/

1966

7.8

/

1972

7

/

2006

8

/

1928

6.9

/

1973

6.4

/

2007

7.4

/

1953

7.5

/

1939

6.2

/

1989

5.7

/

2015

6.7

/

2009

7.471

/

1963

8.3

/

1960

7.6

/

1981

7.7

/

1969

4.767

/

2012

8.1

/

2016

7.4

/

1941

7.2

/

1984