code: public Integer getOccurrencesOf(Double value) {
  		if(!insertStat.containsKey(value))
  			throw new IllegalArgumentException("No occurrences of value \""+value+"\"");
  		return insertStat.get(value);
  	}
docs: Returns the number of occurrences of the given value.
  @param value The value for which the number of occurrences is desired
  @return The number of occurrences of the given value
  @throws IllegalArgumentException if there are no occurrences of <code>value</code>