Problem with Serialization

I have a serialized class which has several attributes, these are static since I need to be modifying them, the problem is that after serialize and save the data, when re-reading all the attributes remain with their default value, in what way can I make those attributes take the value of the data stored previously serialized?

Here's the serialized class:

package Parqueadero;

import java.io.Serializable;

public class Informes implements Serializable {

    //Suma total de dinero
    private static double sdinerot = 0;

    //Suma de dinero por tipo de  clientes 
    private static double sdineroTA = 0;
    private static double sdineroTB = 0;
    private static double sdineroTC = 0;

    //total de clientes segun su tipo 
    private static int tCA = 0, tCB = 0, tCC = 0;

    //Suma de dinero por tipo de vehiculo
    private static double sdinerocarro = 0;
    private static double sdinerocamioneta = 0;
    private static double sdinerobus = 0;
    private static double sdineromoto = 0;

    public double getSdinerot() {
        return sdinerot;
    }

    public void setSdinerot(double total) {
        sdinerot = sdinerot + total;

    }

    public double getSdineroTA() {
        return sdineroTA;
    }

    public void setSdineroTA(double sdineroTA) {
        this.sdineroTA = this.sdineroTA + sdineroTA;
    }

    public double getSdineroTB() {
        return sdineroTB;
    }

    public void setSdineroTB(double sdineroTB) {
        this.sdineroTB = this.sdineroTB + sdineroTB;
    }

    public double getSdineroTC() {
        return sdineroTC;
    }

    public void setSdineroTC(double sdineroTC) {
        this.sdineroTC = this.sdineroTC + sdineroTC;
    }

    public int gettCA() {
        return tCA;
    }

    public void setcCA() {
        tCA++;
    }

    public int gettCB() {
        return tCB;
    }

    public void setcCB() {
        tCB++;
    }

    public int gettCC() {
        return tCC;
    }

    public void setcCC() {
        tCC++;
    }

    public double getSdinerocarro() {
        return sdinerocarro;
    }

    public void setSdinerocarro(double sdinerocarro) {
        this.sdinerocarro = this.sdinerocarro + sdinerocarro;
    }

    public double getSdinerocamioneta() {
        return sdinerocamioneta;
    }

    public void setSdinerocamioneta(double sdinerocamioneta) {
        this.sdinerocamioneta = this.sdinerocamioneta + sdinerocamioneta;
    }

    public double getSdinerobus() {
        return sdinerobus;
    }

    public void setSdinerobus(double sdinerobus) {
        this.sdinerobus = this.sdinerobus + sdinerobus;
    }

    public double getSdineromoto() {
        return sdineromoto;
    }

    public void setSdineromoto(double sdineromoto) {
        this.sdineromoto = this.sdineromoto + sdineromoto;
    }

    public double getPromedioClienteA() {
        if (tCA == 0) {
            return 0;
        }
        return (sdineroTA / tCA);
    }

    public double getPromedioClienteB() {
        if (tCB == 0) {
            return 0;
        }
        return (sdineroTB / tCB);
    }

    public double getPromedioClienteC() {
        if (tCC == 0) {
            return 0;
        }
        return (sdineroTC / tCC);
    }

}