Example of a claims data dataframe
claims_data_xmpl.RdDataframe contains one row for each calendar year per claim where at least one of the
columns Cl_payment_cal, Cl_reserve, An_payment_cal, An_reserve is not 0.
Data belongs to the set of claims_data_xmpl, active_annuities_xmpl and pool_of_annuities_xmpl.