title: Database structure for time span
body: <p>I have a peoples, everybody have:firstname,lastName.
  And everybody have parameters: [car count, money count, cow count...]
  Sometimes this parameters are changing.
  I want have the past parameter counts and present parameter counts for statistic.
  How i must build my db structure?</p>
  
  <p>My version:</p>
  
  <ul>
  <li>[PeopleID(PK): LastName, FirstName]</li>
  <li>[СhangesID(PK): PeopleID(FK), ChangesDate]</li>
  <li>[ParameterID(PK),changesID(FK),DayOfBirth, CarCount, Adress, MoneyCount, CowCount...]</li>
  </ul>