Below is the compiled data available
As you can see, the business grew steadily until the 1860s and never recovered from the Prussian war and the Belgian competition. Probably the death of LB was also involved.
Note: the averages are computed over the last 5 previous samples if available
Best regards,
WC-

Leopold Bernard
# year maker Approx/year

1 1832
3583 1843 Devisme 326
4044 1845 Claudin 311
5196 1848 Fleurey 325
6084 1850 Lepage-Moutier 338
7803 1853 Lepage 422
8184 1854 Perrin 460
11868 1858 667
12377 1859 Mullin 699
16367 1863 Charton 856
16480 1863 Murat 922
17388 1864 Krider 920
19526 1866 Lefaucheux 1021
20374 1867 1002
20938 1868 Lefaucheux 892
22239 1869 Genez 970
22326 1869 Lefaucheux 933
22369 1869 998
22529 1870 Laurdere 796
23177 1870 938
24759 1873 Faure Lepage 608
25605 1874 Faure Lepage 647
27268 1877 677
29601 1881 584
30685 1882 Guyot 658
35237 1898 Roblin 401 H
35321 1898 Rieger 383 H