The overall number of the clusters for the 5-year sub-periods varies between three and eight with the cosine distance method resulting as the optimum for five sub-periods and the correlation distance method optimum for three sub-periods (Table 5).

Table 5

No. . | Period . | Number of clusters . | Distance method . |
---|---|---|---|

1 | 1980–1984 | 3 | Cosine distance |

2 | 1985–1989 | 5 | Correlation distance |

3 | 1990–1994 | 8 | Cosine distance |

4 | 1995–1999 | 5 | Cosine distance |

5 | 2000–2004 | 7 | Cosine distance |

6 | 2005–2009 | 5 | Cosine distance |

7 | 2010–2014 | 5 | Correlation distance |

8 | 2015–2020 | 4 | Correlation distance |

No. . | Period . | Number of clusters . | Distance method . |
---|---|---|---|

1 | 1980–1984 | 3 | Cosine distance |

2 | 1985–1989 | 5 | Correlation distance |

3 | 1990–1994 | 8 | Cosine distance |

4 | 1995–1999 | 5 | Cosine distance |

5 | 2000–2004 | 7 | Cosine distance |

6 | 2005–2009 | 5 | Cosine distance |

7 | 2010–2014 | 5 | Correlation distance |

8 | 2015–2020 | 4 | Correlation distance |

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